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3 years ago

Please help on number 3

Mathematics

1 answer:

kobusy [5.1K]3 years ago

5 0

Answer:

Its the first option.

Step-by-step explanation:

3x + y = 5

5x - 4y = -3

From equation 1:

y = - 3x + 5

Substituting for y:

5x - 4(-3x + 5) = -3

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A pencil has density of .875 g/ml and a mass of 3.5 grams what is the volume?

SSSSS [86.1K]

Answer:

4 ml

Step-by-step explanation:

m = D/ v where m is mass and D is density and V is volume

.875 = 3.5 / V

Multiply each side by V

.875 V = 3.5

Divide each side by .875

V = 3.5/.875

V =4

8 0

3 years ago

Read 2 more answers

Raise v to the 4th power, then divide 6 by the result

sertanlavr [38]

raise v to the 4th power, then divide 6 by the result

6/(v^4)

5 0

3 years ago

Which of the following is the equation of a line in slope-intercept form for a

shtirl [24]

Answer:

y=1/3x-4

Hope this helps :)

3 0

3 years ago

During an Apollo moon landing, reflecting panels were placed on the moon. This allowed Earth-based astronomers to shoot laser be

rusak2 [61]

Answer:

The distance between the astronomers and the moon was $7.56*10^{8]$ meters.

Step-by-step explanation:

We have that the speed is the distance divided by the time, so:

$v = \frac{d}{t}$

In this problem, we have that:

The reflected laser beam was observed by the astronomers 2.52 s after the laser pulse was sent. This means that $t = 2.52$ .

If the speed of light is 3.00 times 10^8 m/s, what was the distance between the astronomers and the moon?

We have that $v = 3*10^{8}$ m/s.

We have to find d. So:

$v = \frac{d}{t}$

$d = vt$

$d = 3*10^{8}*2.52$

$7.56*10^{8]$

The distance between the astronomers and the moon was $7.56*10^{8]$ meters.

7 0

4 years ago

In a given amount of time, Jamie drove four times as far as Rhonda. Altogether they drove 125 miles. Find the number of miles dr

lbvjy [14]

Answer:

Step-by-step explanation:

Theres a ratio of 1:4

Where Jamie has driven 4 times as much as Rhonda

meaning that you can plug in values, 1:4=125

the 4 represents Jamie since she drove farther than rhonda

Rhonda drove 25 miles, and Jamie drove 100 miles

25(4)+25=124

8 0

3 years ago